#include <stdio.h>
#include <stdlib.h>

typedef struct node Node, *NodePtr;
typedef struct doublyLinkedList DLinkedList, DLinkedListPtr;

// 定义双向链表结构
typedef struct node {
    int data;
    NodePtr prev;
    NodePtr next;
} Node, *NodePtr;

// 定义双向链表结构体
typedef doubleLinkedList {
    int length;
    NodePtr head;
    NodePtr tail;
} DLinkedList, DLinkedListPtr;

int main() {
    printf("main ...\n");


    return 0;
}